How to check the serial number on a dollar?

To check the serial number on a dollar bill, simply look at the front side of the bill, where you’ll find a unique combination of letters and numbers in the top right corner and bottom left corner. The serial number is typically printed in green ink. You can also compare the serial number with other bills to ensure they are not identical, as each number is unique to a specific bill. If you're checking for authenticity, consider also examining other security features alongside the serial number.